1. Fuel System:
* Fuel Pump: This is a very common cause. The pump might be weak, failing to deliver enough fuel pressure to sustain operation. Listen carefully near the fuel tank for the hum of the fuel pump when you turn the key to the "on" position (before cranking). No hum suggests a faulty pump. A weak hum might also indicate a failing pump.
* Fuel Filter: A clogged fuel filter will restrict fuel flow. This is a relatively inexpensive and easy part to replace.
* Fuel Pressure Regulator: This component regulates the fuel pressure in the system. A malfunction can cause erratic fuel delivery. You'll likely need a fuel pressure gauge to test this.
* Fuel Injectors (if fuel-injected): Clogged or faulty injectors can prevent adequate fuel delivery. Testing injectors requires specialized tools and knowledge.
* Empty Fuel Tank (obvious but important!): Make sure you actually have fuel in the tank.
2. Ignition System:
* Crankshaft Position Sensor (CKP Sensor): This sensor tells the computer the position of the crankshaft. A faulty CKP sensor can cause the engine to start and then die as the computer loses the signal.
* Camshaft Position Sensor (CMP Sensor): Similar to the CKP sensor, a faulty CMP sensor can interrupt the timing signal, leading to the engine stalling.
* Ignition Coil: A weak or failing ignition coil might provide enough spark to start the engine, but not enough to keep it running.
* Distributor Cap and Rotor (if applicable): For older Capri models with distributors, worn or damaged parts can cause intermittent spark. Inspect for cracks, carbon tracking, or corrosion.
* Spark Plugs and Wires: Worn or fouled spark plugs or damaged wires can prevent proper ignition.
3. Other Possibilities:
* Air Intake System: A large vacuum leak in the intake system can cause the engine to stall. Check all hoses and connections for cracks or looseness.
* Throttle Position Sensor (TPS): A faulty TPS can give the computer incorrect information about throttle position, leading to engine stalling.
* Mass Airflow Sensor (MAF Sensor) (if applicable): If your Capri has a MAF sensor, a faulty sensor can cause incorrect fuel/air mixture leading to stalling.
* Engine Coolant Temperature (ECT) Sensor: This sensor might be sending a false reading, causing the computer to make incorrect fuel adjustments.
Troubleshooting Steps:
1. Check for obvious things first: Fuel level, loose wires, vacuum leaks.
2. Listen for the fuel pump.
3. Check spark plugs and wires. Inspect for fouling or damage.
4. If you have basic mechanical skills, replace the fuel filter. This is a cheap and easy fix that often solves the problem.
5. Consider getting the codes read: A diagnostic scan tool can read trouble codes stored by the engine's computer, providing valuable clues. Auto parts stores often offer this service for free.
Important Note: Without more information about your specific Capri model (year, engine type), giving more precise advice is difficult. If you're not comfortable working on your car yourself, take it to a qualified mechanic for diagnosis and repair. Attempting complex repairs without the necessary knowledge and tools can cause further damage.
